Exterior Drywall Sheathing

I have a home built in 1945. Instead of putting wood on the outside of the studs they used 2 foot wide sections of gypsum wallboard. Covering the wallboard is cedar siding. Any tips on dealing with this situation? Thanks

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Exterior Drywall Sheathing

Sure it's not form of cement plaster board? Not sure why they would have use it outside unless they where planning on stucco walls, but it was common many years ago on the inside of homes.
Got a picture of it?

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Exterior Drywall Sheathing

No. They used the same stuff inside and out. Inside is plaster covered wallboard. The house may have been constructed during the war so materials were scarce. Anyway after 70 years it is disintegrating.